Status of the Cabibbo-Radicati sum rule and a new test of vector meson dominance

Using finite energy sum rules the high energy contribution to the Cabibbo-Radicati sum rule is calculated and shown to be of the proper magnitude and sign, so that this sum rule is exactly satisfied. In addition the coupling of the rho Regge trajectory to two charged photons is calculated and found to be in agreement with the predictions of vector meson dominance and universality for the Reggeized rho vertex, within the expected accuracy. (11 refs).